{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T13:29:25Z","timestamp":1777901365028,"version":"3.51.4"},"reference-count":38,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2021,1,23]],"date-time":"2021-01-23T00:00:00Z","timestamp":1611360000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"German Federal Ministry of Education and Research (BMBF) in the context of the German Na-tional Genom Research Network (NGFN)","award":["01GS0499"],"award-info":[{"award-number":["01GS0499"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>KCNQ1 encodes the voltage-gated potassium (Kv) channel KCNQ1, also known as KvLQT1 or Kv7.1. Together with its \u00df-subunit KCNE1, also denoted as minK, this channel generates the slowly activating cardiac delayed rectifier current IKs, which is a key regulator of the heart rate dependent adaptation of the cardiac action potential duration (APD). Loss-of-function mutations in KCNQ1 cause congenital long QT1 (LQT1) syndrome, characterized by a delayed cardiac repolarization and a prolonged QT interval in the surface electrocardiogram. Autosomal dominant loss-of-function mutations in KCNQ1 result in long QT syndrome, called Romano\u2013Ward Syndrome (RWS), while autosomal recessive mutations lead to Jervell and Lange-Nielsen syndrome (JLNS), associated with deafness. Here, we identified a homozygous KCNQ1 mutation, c.1892_1893insC (p.P631fs*20), in a patient with an isolated LQT syndrome (LQTS) without hearing loss. Nevertheless, the inheritance trait is autosomal recessive, with heterozygous family members being asymptomatic. The results of the electrophysiological characterization of the mutant, using voltage-clamp recordings in Xenopus laevis oocytes, are in agreement with an autosomal recessive disorder, since the IKs reduction was only observed in homomeric mutants, but not in heteromeric IKs channel complexes containing wild-type channel subunits. We found that KCNE1 rescues the KCNQ1 loss-of-function in mutant IKs channel complexes when they contain wild-type KCNQ1 subunits, as found in the heterozygous state. Action potential modellings confirmed that the recessive c.1892_1893insC LQT1 mutation only affects the APD of homozygous mutation carriers. Thus, our study provides the molecular mechanism for an atypical autosomal recessive LQT trait that lacks hearing impairment.<\/jats:p>","DOI":"10.3390\/ijms22031112","type":"journal-article","created":{"date-parts":[[2021,1,25]],"date-time":"2021-01-25T02:07:00Z","timestamp":1611540420000},"page":"1112","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Molecular Mechanism of Autosomal Recessive Long QT-Syndrome 1 without Deafness"],"prefix":"10.3390","volume":"22","author":[{"given":"Annemarie","family":"Oertli","sequence":"first","affiliation":[{"name":"Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg, 35037 Marburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Susanne","family":"Rinn\u00e9","sequence":"additional","affiliation":[{"name":"Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg, 35037 Marburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robin","family":"Moss","sequence":"additional","affiliation":[{"name":"Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg\u2013Bad Krozingen, Medical Center-University of Freiburg, 79110 Freiburg, Germany"},{"name":"Faculty of Medicine, University of Freiburg, 79110 Freiburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefan","family":"K\u00e4\u00e4b","sequence":"additional","affiliation":[{"name":"Department of Medicine I, University Hospital, LMU Munich, 80336 Munich, Germany"},{"name":"Deutsches Zentrum f\u00fcr Herz-Kreislauferkrankungen (DZHK), Partner Site Munich, 80636 Munich, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gunnar","family":"Seemann","sequence":"additional","affiliation":[{"name":"Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg\u2013Bad Krozingen, Medical Center-University of Freiburg, 79110 Freiburg, Germany"},{"name":"Faculty of Medicine, University of Freiburg, 79110 Freiburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Britt-Maria","family":"Beckmann","sequence":"additional","affiliation":[{"name":"Department of Medicine I, University Hospital, LMU Munich, 80336 Munich, Germany"},{"name":"Institut f\u00fcr Rechtsmedizin, Forensische Molekularpathologie, Universit\u00e4tsklinikum Frankfurt, 60590 Frankfurt, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9433-687X","authenticated-orcid":false,"given":"Niels","family":"Decher","sequence":"additional","affiliation":[{"name":"Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg, 35037 Marburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1085\/jgp.96.1.195","article-title":"Two components of cardiac delayed rectifier K+ current. 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